linux-kernel - Re: [PATCH] perf_counter tools: Fix memory leaks of add

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Message-ID: <YaACZsT6pupginXC@kernel.org>
Date:   Thu, 25 Nov 2021 18:38:46 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Sohaib Mohamed <sohaib.amhmd@...il.com>
Cc:     irogers@...gle.com, linux-perf-users@...r.kernel.org,
        Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf_counter tools: Fix memory leaks of add_cmdname()

Em Fri, Nov 19, 2021 at 10:46:36AM +0200, Sohaib Mohamed escreveu:
> ASan reports some memory leaks when running:
> 
> $ perf xyz
> 
> This patch adds the missing clean_cmdnames()
> 
> Fixes: 078006012401 ("perf_counter tools: add in basic glue from Git")
> 
> Signed-off-by: Sohaib Mohamed <sohaib.amhmd@...il.com>
> ---
>  tools/lib/subcmd/help.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tools/lib/subcmd/help.c b/tools/lib/subcmd/help.c
> index bf02d62a3b2b..4a433f4d19a1 100644
> --- a/tools/lib/subcmd/help.c
> +++ b/tools/lib/subcmd/help.c
> @@ -187,6 +187,7 @@ static void list_commands_in_dir(struct cmdnames *cmds,
>  
>  		add_cmdname(cmds, de->d_name + prefix_len, entlen);
>  	}
> +	clean_cmdnames(cmds);

Have you tested this?

Look at this usage:

void load_command_list(const char *prefix,
                struct cmdnames *main_cmds,
                struct cmdnames *other_cmds)
{
        const char *env_path = getenv("PATH");
        char *exec_path = get_argv_exec_path();

        if (exec_path) {
                list_commands_in_dir(main_cmds, exec_path, prefix);
                qsort(main_cmds->names, main_cmds->cnt,
                      sizeof(*main_cmds->names), cmdname_compare);
                uniq(main_cmds);
        }


If you call clean_cmdnames() in list_commands_in_dir() that call to
qsort will be with main_cmds emptied, no?

- Arnaldo


>  	closedir(dir);
>  	free(buf);
>  }
> -- 
> 2.25.1

-- 

- Arnaldo